Projection screen



UNITED STATES PAVITE NT OFFICE;

ARTHUR L. MACBETI-I, 0F BALTIMORE, MARYLAND, ASSIGNOR TO DAYLIGI-ITMOTION PICTURE 00., OF WASHINGTON, DISTRICT OF COLUMBIA, A CORPORATIONOF WEST VIRGINIA.

PROJECTION SCREEN.

No Drawing.

This invention relates to projection screens and is designed primarilyfor use in the daylight exhibition of projected through of glaring raysthat would mar,

the vision and be lnjurious to the eyes of persons seated in front ofthe screen.

It is an object of the presentinvention to provide a screen which isinexpensive to produce and which overcomes the disadvantages mentionedby meeting the stated requirements.

With the foregoing and other objects in View, which will appear as thedescription proceeds, the invention consists of certain novel detailsand combinations which will be hereinafter more fully described and.

pointed out in the claims, it being understood that various changes maybe made therein within the scope of the claims, with out departing fromthe spirit of the inven-' tion.

In making the screen there is provided a base of a suitable fabric suchas silk, linen or cotton. Under some conditions it has been founddesirable to first saturate this After this initial treat- Applicationfiled November 16, 1925. Serial No. 69,500.

following ingredients substantially in the proportions stated, to wit:

Parts by bulk. Canadian balsam 2 Oil of sassafras 2 Litharge 1 Purelinseed oil 5 The foregoing ingredients are thoroughly mixed and thefabric is submerged therein so as to become saturated. Thereaftersurplus material is wiped from the surface of the fabric and saidsurface is rubbed so as to be left smooth. The screen thus produced isallowed to dry and the resultant article will be translucent andopalescent and will act as a screen to prevent the pas sage therethroughof the glare or bright rays which would otherwise prevent satisfactoryuse of the screen.

In the mixture constituting the treating material the Canadian balsamacts as a binder for holding the preparation to the fabric and, in asense, has the same properties as the diluted bullocks blood. Theoil ofsassafras increases the penetrating 'quality of the mixture and thelitharge gives body theretof The linseed oil forms the main ingredientand serves to give the screen a smooth, weatherproof surface having thedesirable sheen.

lVhen images are projected against the back of a screen made as hereindescribed, they will be displayed in a soft restful light through thescreen and will be plainly visible in daylight when the conditions aremet as called for in my patent hereinbefore mentioned.

It might be stated that an added advantage in using oil of sassafrasinthe mixture is that this oil has been found to prevent discolorationof the screen under the action of light rays.

What is claimed is:

l. A projection screen including a fabric base, and heat and moistureresisting means for rendering the base translucent, opalescent andweatherproof, said meansincluding a solution of Canadian balsam, andlinseed oil.

2. A projection screen including a fabric base, and heatand moistureresisting means 3. A. UPUjUUUUH M's-c011 inuhullngi mmw base, and heatand IHOISUHQ remshng: mmum 1mm and Weatherproof, said means iin-lmlinggJmiadiiin 15211521111, linseed oil, oil of szlsszl'ims and :1 filler.

A projection screen 11101 mung n Min-M base, and nleans Pm: rmu'leir'mgthe bilfiU

